Sedimentary Rock (Specifically A Chemical Sedimentary Rock, Or A Chert If Considered Purely Mineral Aggregate)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Dalmatian Stone (often misnamed Dalmatian Jasper)

Aplite (with hornblende/arfvedsonite inclusions)

Conglomerate

Conglomerate (clastic sedimentary rock)

Pyrite in Shale

Iron Disulfide (FeS2)

Granite Gneiss

Granitic Gneiss

Gneiss

Gneiss (High-grade metamorphic rock)

Chert (Commonly known as Flint)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Flint variant)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Gneiss

Gneiss (High-grade regional metamorphic rock)

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Satin Spar (Gypsum)

Hydrous Calcium Sulfate (CaSO4·2H2O)

Red Jasper

Silicon Dioxide (SiO2) containing Iron Oxide inclusions

Petrified Wood

Silicified Wood (SiO2)

Wishing Stone (Quartz-veined Siltstone or Graywacke)

Hydrothermal Quartz vein in matrix of SiO2 (Quartz) and Al2O3 (Clay minerals)

Mica Schist

Mica Schist (Schistose metamorphic rock rich in Muscovite/Biotite)

Chert (Jasper variety)

Cryptocrystalline quartz (SiO2)

Chert (Grey Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Conglomerate

Conglomerate (Clastic sedimentary rock)

Ironstone Concretion (Ironstone Gourd)

Limonite/Goethite Concretion (FeOO(H))

Sandstone (Quartz-rich)

Arenite (SiO2)

Chert (often called Flint or Jasper)

Silicon Dioxide (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Jasper (Iron-stained Chert)

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Shale

Shale (clastic sedimentary rock)

River Cobble (likely Sandstone or Siltstone type)

Sandstone or Siltstone (common rock types that form river cobbles)

Conglomerate

Conglomerate (clastic sedimentary rock)

Red Jasper (Opaque Chalcedony)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Limestone with Calcite Veins

Sedimentary Calcium Carbonate (CaCO3)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Chert (Field-collected variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Jasper)

Silicon Dioxide (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Conglomerate (River Rock Aggregate)

Conglomerate (Lithic-clast conglomerate)

Limestone

Calcite-rich Sedimentary Rock (CaCO3)

Limonite/Goethite on Shale

Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock

Concretion

Various mineral compositions, typically carbonate or iron oxide cemented sediment

Quartz Pebble

Silicon Dioxide (SiO2)

Shale (sub-type: Carbonaceous Shale)

Lutaceous Sedimentary Rock

Greenstone

Metamorphosed Mafic Igneous Rock

Banded Agate (specifically Carnelian Agate color)

Silicon Dioxide (SiO2) - variety of Chalcedony